john: four years later, fewer cross illegally because the mexican economy has done better. we build bigger, stronger fences. john: as the border patrol now we are here? >> oh, yes. john: an hour later they showed up. >> filming a segment. i intend donald -- ten donnelly. john: after that the left them one. once more fences. >> is this your ideal fans? >> ts is good. it forces people w wantt to smuggle something to go to a high point where law-enforcement border patrol ents can easil see they have been interdicted. we ought t secure it. john: a problem with the current fans. >> here is this biggeffective miti dance. impervious, scalable. then all the suddenn it just hands. is right here is absurd. >> despite the billions we have spent, there are still lots of balls in the fen. especially the older part. >> ts looks like a pretty good-sized already your. >> this is an area that we have volunteers who came down with welding track and well that up these holes. i mean, it is patchwo. >> i'm touching mexico. john: not that hard to get over the fence. drug dealers build ramps. thi